Trihydroxystearin

AKA: 139-44-6, 1, 2, 3-Propanetriyl tris(12-hydroxyoctadecanoate), CUTINA BW, Glyceryl tri(12-hydroxystearate), Octadecanoic acid, 3-propanetriyl ester, 1''-(1, 3-propanetriyl) ester
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Synthetic
Skin Conditioner
Synthetic
Clean
OriginDerived from stearic acid, a saturated fatty acid typically sourced from vegetable oils or animal fats. Produced through catalytic hydrogenation of unsaturated fatty acids followed by esterification with glycerol.
Trihydroxystearin is a cosmetic ingredient. Also known as 139-44-6. Rated low hazard by EWG.
Formula
C57H110O9
Mol. Weight
939.50
CAS #
139-44-6
Form
Powder
Skin Types
●all-skin-types
Best For
General
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Conditions Skin
Controls Viscosity
Controls product thickness
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory0 listings
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Insufficient
Pregnancy
—
CIR Safety Findings
Not a Skin Irritant
2 studies / 2 not irritating (CIR 266)
Eye Irritant in Testing
1 study / 1 irritating / reactions mild (CIR 266)
Concentration Guide
Leave-on0.01–14.7%
Rinse-off0.25–6.6%
0%50%100%
CIR reported use · 2017 survey
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR
murphy